Bill Hayden did the obvious: He forked AtheOS (which is technically similar to BeOS) and used its app_server and Interface Kit (without the use of X11) and rest of its kits on top of the 2.4.x Linux kernel. While the AtheOS kernel has some very nice features, by being modular, semi-microkernel, with good preemptive/multithreading support etc., it lacks a solid VM and swap support and of course, it lacks a good driver support, things that the Linux kernel provides. Bill Hayden accounced his fork on the AtheOS mailing list and made known that the "Atheos API has been merged with the BeOS API, there is PowerPC support, gcc 3.0.X compatiblity and OpenTracker/Deskbar as the desktop manager".